First of all, these are great fish, we have loads of different types!
Hujeta, grow to around 10". Regardless of what is read, we have a friend who has been in the trade for 35 years and has neber known of any bigger than that.
We have 3 Hujetas, all around 10". They are very skittish, and are spooked easily so are better in groups with their own kind. Water changes must be done carefully to prevent them swimming into the sides of the tank and harming themselves.
They eat whitebait but take a while to get feeding. Younger ones should take chopped cockle mussel and prawn, and bloodworms. Our 3 are in a 400 litre tank, they mainly stay over one side, together, at the surface.
As for the needlenose, we don`t keep them but they are very similar.
We also keep Florida and spotted Gars but they grow bigger. We have 4 small ones growing on with 3 small Hujeta and the spotted Gars troubled the fins at first but then have been okay since.
The Hujeta will join the other 3 soon, then the sotted Gars will join the other spotted Gars, they reach 18" so they could not stay together for long.
The spotted Gars have rows of teeth which can inflict damage but the Hujeta have a different type of mouth and are much more peaceful showing no aggresion to eachother or anyone else in the tank.
They can be kept with Plecos, Polypterus ( as long as they are of equivalent size ), beware of Weeksii though!!
Also non agressive cats which grow 8 - 10 inch. We have Sun Catfish with ours.
The only thing they don`t seem to like are free swimming surface fish, they prefer slower moving bottom dwellers which won`t spook them.
In my opinion, Gars are a great choice and these kind will NOT grow huge. Anything else you need to know, ask on forum or PM me.
Clare